I once posted some stats from the SEC and NASD compiled from the trading records of day trading firms in the 90s. The wording was so convoluted it was hard to understand, but it seemed to say that "most fail".
Anybody who just flatly says "X% of traders fail" is probably just talking out thier ass. I blew out an account once due to trading losses. So does that mean I failed? You could say that if you want to, but a few months later I saved the wages from my job and started trading again. I did fair to middlin and then I blew the transmission in my car. So I took most of the money out of my trading account to pay for it, does that mean I failed? Again, you could say that and I probably wouldn't argue too much. Sometime again later, and again with money earned from wages as an employee, I started trading again. And after 12 months I had spectacular triple digit gains. Does that mean I'm one of the 5, 10 or 20% elite who are considered a success? Well, maybe. But then a few months later I was a defendant in criminal proceedings, (not trading related!), and I needed the money out of my account yet again to defend myself. So once agian my trading account is down to, literally, $0.45. I'll be back in the game in about a month, let's see how long I can keep it going this time and see which side of the statistics I end up on.